Hard-metal alloy and the process of making same



' Aug-1 11",: l

. NITEDf ESTATE-S.

sc'n n'ogmn'br 15mm, 01mm, 'nssrenon roommat- M1329 0011mm, A-conrom'nouon NEW 2031:. p I

m i na I i ibima ma mmam Be it known that PI, KARI: '8"

citizen: qt thefGerman Realm, residingat Lichtenberg, near Berlin, Germany, have-1nin Hardf Metal Alloys and the Processes of vented certain new and useful Improvements Making T'Same, of which the following is a which is {particularly suitablefor making known alloys primarily'by'consisting of a" tungstic carbide with a carbon content of from 4: to 10 percent, in combination with specification. 1-

-My invention relates tohard metal alloys. More particularly, it relates to alloyed tun stic' carbide which alloy is suitable for making working implements-of various sorts and hones.

an auxil'ia metalof a considerably lower melting; p'omt as, for instance, iron, cobalt or nickel, in quantitles' up to a maximum of p 10- per cent. A tungstic' metal thus consti- To make the new allo s,--'it carbide. containing from 3 to 10 per cent carif. occurs .at t'emperaturesjwhichd-ie in the neighborhood of 1000 degrees belowjthe. 9:

-- perioi" to: these for strength.

Q -fin'ely J thelimits specified, and to heat this Body to .j 35. auxih 'e.

tutes the .pr'edominating element amounting I te at least '80 per cent of the total content -'of'the alloy.- The new alloy is not interior fin res eat to hardness to the known tiihgstic carbi e alloys and is quiteconsiderably sir-- to press into a body' oi pulvcrized-rtungstic "together with' a'nflauxiliary' metal? in 'a divided state and in a quantity-within sinteringjtemperature. -The effect of the 7 ;metal is to" reducethe' sintering point o body to such' an extent that it '-;.:1;, going method is considerably cheaper easier and simpler than the methods used hereto: :iore inthe prior methodsiand: a temperature of them 2500degrees must ,be. obtained." Another ob'ect of 'myjinvention-"is' that inasmuch-as tehody maybe pr, sintered in a manner well known,"itii;-os j" sible'to make the-'bodyintoany desired'form, such" as. is obtained. onlyjwith. greatflifliv v h a e p d d .ei Powder from h m hw; q y

when other processes are used.

- and ear-bide can be i sed as the main-materia carbl fri'zingtung Applicationflled emb r-en; was. Serial no. 072.014.

The alloy of invention difiers from" 's advantageous.

ing-point'ofthe purecarbide. The-forc v p v bide of-tungstemthe'car oncontent of which. ranges from 3 to;10%T;'f' the tu'n gsten, said 91;

ofo-the tungsten content.

'2.- A hard metal all y comprising I akm'g the new. na pnlverizedjtungi t 1,549,615 PATENT. OFFICE-. 3,

J nan-gnu, nil-pox Ann me mom or MAKING sum Ra'ssuw 1 ing the tnngstic powder with carbon; --The 56 carbon may .be 'of' soot, sugar 'of carbon," graphite and the like, A carbon content. of

'7' 'per cent has proved especially favorable, 1

but it can be varied home to 10' "er c'enti A.met'al which can be reduce by. h dromelting point than 'the tungstie @enbide is suitable for use'as the auxilia' metal, for

example, iron, cobaltor nickel. base metals may be m a'finely divided form. The tem'- perature at which the sinterin occurs, is. affected by the quantity oi the. a 'xed'aux'-' iliary metal, which can be'pm ade as high as 10 cent of the alloy. For instance, admixture of 5 per cent cobalt has proved- 7o two or several of the auxiliary metalsma 76 be addedv toe-the tungstic powder-in whic case'the auxil ary, metals can be taken-in- -any suitable ratio to each. other, b t 5 3 must not, all told, make up more than 10, 1 per cent of the total qggntity 'of thefalloy 'Iihe sintering of the dies, wh chibodies areiormedv for instance by hydraulicipressure, can be efiected' by heating'them--in-}a h protective atmosphere such as'a-n atmosphere" of hydrogen, nitrogen, argon, illuminating 88 gas, carbonic oxide, or an admixture ofsuch gases, or the sintering can be-e'fi'ecte'd by embedding 1: e'bodies in carboni-graphiteand; the like. Siiitable- 1 temperature ay be found between 1 500. andf gqq v grees'C-.fa

, Wh t I claim as new and desire to secure by-Letters Patent'of the'UnjitedfStates, :isf'z' 1. A hard-metal allo comprising a ca'r alloy having, inaddition, a metalgofa con:

bide, said metal forming'not more the bide of tungsten,- the carbon content ciwhich es fiamat 10% of the tungsten',l.said.- alloy having ametal 'of the iron group, the.

latter 'formingnot f'more. than 10% of the tungsten content.

i wj u me a v a w if a gen and which has a considerably ower .3.;9A. hard metal alloy" comprising .a car? H ranges from 3 to 10% of the tungsten, said: alloy having iron, the latter forming not more than 10% of the content.

4;. The method of making an alloy of a carbide of tungsten and a metal which consists in bringing, together a pulverized tun'ge sten carbide and a quantity of finely divided metal, mixing said materiaIsand pressing them into forms and heating the forms to sintering temperature;

5.. The method of. making an alloy of a. carbide of'tungsten and a metal which conslsts in bringing together a pulverized tungsten carbide, said carbide having a carbon content within the ranges of from 3 to 10%,

- of thecarbide, the proportions of the tungsten carbon and of the metal being respectively not more than 80% of tungsten, 10% of carbon and 10% of the metal.

In Witness whereof, I have hereunto set my hand this 8th day of October, 1923.

KARL scHRoTER. 

